CVE-2021-41186
The parser_apache2 plugin in Fluentd v0.14.14 to v1.14.1 suffers from a regular expression denial of service (ReDoS) vulnerability.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Fluentd collects events from various data sources and writes them to files to help unify logging infrastructure. The parser_apache2 plugin in Fluentd v0.14.14 to v1.14.1 suffers from a regular expression denial of service (ReDoS) vulnerability. A broken apache log with a certain pattern of string can spend too much time in a regular expression, resulting in the potential for a DoS attack. This issue is patched in version 1.14.2 There are two workarounds available. Either don't use parser_apache2 for parsing logs (which cannot guarantee generated by Apache), or put patched version of parser_apache2.rb into /etc/fluent/plugin directory (or any other directories specified by the environment variable `FLUENT_PLUGIN` or `--plugin` option of fluentd).
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.21% probability · 82th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- fluentd/fluentd
- Source
- security-advisories@github.com
References
- https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142Release Notes, Third Party Advisory
- https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662Third Party Advisory
- https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.mdBroken Link
- https://github.com/fluent/fluentd/blob/master/CHANGELOG.md#v1142Release Notes, Third Party Advisory
- https://github.com/fluent/fluentd/security/advisories/GHSA-hwhf-64mh-r662Third Party Advisory
- https://github.com/github/securitylab-vulnerabilities/blob/52dc4a2a828c6dc24231967c2937ad92038184a9/vendor_reports/GHSL-2021-102-fluent-fluentd.mdBroken Link
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.